RATIONALE: Diagnostic procedures, such as PET scan and CT scan, may help doctors determine the extent of cancer and predict a patient's response to treatment and help plan the best treatment. PURPOSE: This clinical trial is studying how well PET scan combined with CT scan evaluates treatment response in patients undergoing treatment for bone cancer or soft tissue sarcoma.
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Determine whether device that combines fludeoxyglucose ^18F positron-emission tomography (FDG-PET) and CT scanning (FDG-PET/CT) can accurately locate and determine disease in patients who are undergoing treatment for bone or soft tissue sarcoma.
Timeframe: 6 months